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Finance income and charges - Narrative (Details) - Venezuela - Bs. / £	6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of geographical areas [line items]
Movement in Price Index in hyperinflationary economy	158.00%	479.00%
Venezuelan Bolivar Soberano
Disclosure of geographical areas [line items]
Closing foreign exchange rate	593	64

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Movement In Price Index In Hyperinflationary Economy

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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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